COX‘S BAZAR, Bangladesh (Reuters) - Pressure mounted on Myanmar on Tuesday to end violence that has sent more than 300,000 Rohingya Muslims fleeing to Bangladesh, with the United States calling for protection of civilians and Bangladesh urging safe zones to enable refugees to go home. The government of Buddhist-majority Myanmar says its security forces are fighting Rohingya militants behind a surge of violence that began on Aug. 25, and they are doing all they can to avoid harming civilians. The government says about 400 people have been killed in the fighting, the latest to rock Rakhine State in western Myanmar.